Messages in this thread | | | Date | Wed, 30 Mar 2016 01:22:17 +0300 | From | Yury Norov <> | Subject | Re: arm64: kernel v4.6-rc1 hangs on QEMU |
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On Wed, Mar 30, 2016 at 12:12:30AM +0200, Arnd Bergmann wrote: > On Wednesday 30 March 2016 01:05:02 Yury Norov wrote: > > Checked for both v4.6-rc1 and current master (1993b17). > > Config: arm64 defconfig > > QEMU: QEMU emulator version 2.3.0 (Debian 1:2.3+dfsg-5ubuntu9.2) > > > > Stacktrace: > > #0 arch_counter_get_cntvct () at > > ./arch/arm64/include/asm/arch_timer.h:121 > > #1 __delay (cycles=1024) at arch/arm64/lib/delay.c:31 > > #2 0xffffff8008340970 in __const_udelay (xloops=<optimized out>) at > > arch/arm64/lib/delay.c:41 > > #3 0xffffff800815420c in panic (fmt=<optimized out>) at > > kernel/panic.c:257 > > #4 0xffffff80080be588 in do_exit (code=11) at kernel/exit.c:666 > > #5 0xffffff8008089d08 in die (str=<optimized out>, regs=0xffffff8008aebe20 <init_thread_union+15904>, err=143867376) at arch/arm64/kernel/traps.c:298 > > #6 0xffffff8008089dec in arm64_notify_die (str=<optimized out>, regs=<optimized out>, info=<optimized out>, err=<optimized out>) at arch/arm64/kernel/traps.c:309 > > #7 0xffffff800808212c in do_undefinstr (regs=0xffffff8008aebe20 <init_thread_union+15904>) at arch/arm64/kernel/traps.c:399 > > #8 0xffffff8008a1fe08 in cpuinfo_store_boot_cpu () at arch/arm64/kernel/cpuinfo.c:252 > > #9 0xffffff8008a1fe08 in cpuinfo_store_boot_cpu () at arch/arm64/kernel/cpuinfo.c:252 > > #10 0xffffff8008a20388 in smp_prepare_boot_cpu () at arch/arm64/kernel/smp.c:403 > > #11 0xffffff8008a1d6ec in start_kernel () at init/main.c:511 > > #12 0xffffff80080811d8 in __mmap_switched () at arch/arm64/kernel/head.S:437 > > Backtrace stopped: previous frame identical to this frame (corrupt stack?) > > > > Undefined instruction in cpuinfo_store_boot_cpu() could be related > to the SYS_ID_AA64MMFR2_EL1 access that was recently added. > > What does the architecture say about reading unknown cpuid registers? > > Arnd
ThunderX has some unimplemented system registers. AFAIR, attempt to access it causes data abort.
Yury.
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